BalsaUSA kit ($140):
https://www.balsausa.com/store/produ...?id_product=51

He'll need 4 or 6 metal gear servos (I use Hitec). ($120-$150) I use Towerhobbies.com

He may want to stay in 72MHz radios if he still has one or move up to the current 2.4GHz radios which are becoming the de-facto standard. ($450-$700) (I use a Futaba 10-CAG, but many others are using a Spectrum. There are many mfgs now to choose from.)

As far as an engine a DLE-20 "gasser" would be fantastic.
(ValleyViewRC @$270 http://www.valleyviewrc.com/DLE-20cc%20Gas%20Engine.htm )

Or a Saito FA125 methanol engine. Both would haul the aircraft around nicely.
(Horizon Hobby @ $390 http://www.horizonhobby.com/Products...rodID=SAIE125A )

Hope he feels better and welcome back!